<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{padding: 0; margin:0;}
        /* 2560*1366 */
        div{
            width:1600px;
            height:750px;
            background-position: center;
            background-attachment: fixed;
        }
        .box1{
           
            background-image: url(images/bg1.png);
           
        }
        .box2{
          
            background-image: url(images/bg2.png);
           
        }
        .box3{
          
            background-image: url(images/bg3.png);
           
        }
    </style>
</head>
<body>
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
</body>
</html>